Transition of the Reaction from Three-Phase to Two-Phase by Using a Hybrid Conductor for High-Energy-Density High-Rate Solid-State Li-O2Batteries

作     者：Dr. Changtai Zhao Dr. Yuanmin Zhu Dr. Qian Sun Dr. Changhong Wang Jing Luo Dr. Xiaoting Lin Dr. Xiaofei Yang Dr. Yang Zhao Ruying Li Dr. Shangqian Zhao Dr. Huan Huang Dr. Li Zhang Dr. Shigang Lu Prof. Meng Gu Prof. Xueliang Sun 

作者机构：Department of Mechanical and Materials Engineering University of Western Ontario London ON N6A 5B9 Canada Department of Materials Science and Engineering SUSTech Academy for Advanced Interdisciplinary Studies Southern University of Science and Technology Shenzhen 518055 China China Automotive Battery Research Institute Co. Ltd. Beijing 100088 China Glabat Solid-State Battery Inc. 700 Collip Circle London ON N6G 4X8 Canada 

出 版 物：《Angewandte Chemie》 (应用化学)

年 卷 期：2020年第133卷第11期

页      面：5885-5890页

学科分类：081704[工学-应用化学] 08[工学] 0817[工学-化学工程与技术] 

主　　题：air electrodes hybrid conductors in situ TEM interfaces solid-state Li-O2 batteries 

摘      要：Solid-state Li-O 2 batteries possess the ability to deliver high energy density with enhanced safety. However, designing a highly functional solid-state air electrode is the main bottleneck for its further development. Herein, we adopt a hybrid electronic and ionic conductor to build solid-state air electrode that makes the transition of Li-O 2 battery electrochemical mechanism from a three-phase process to a two-phase process. The solid-state Li-O 2 battery with this hybrid conductor solid-state air electrode shows decreased interfacial resistance and enhanced reaction kinetics. The Coulombic efficiency of Li-O 2 battery is also significantly improved, benefiting from the good contact between discharge products and electrode materials. In situ environmental transmission electron microscopy under oxygen was used to illustrate the reversible deposition and decomposition of discharge products on the surface of this hybrid conductor, visually verifying the two-phase reaction.